Virtual Environments

Stanney, Kay M.; Cohn, Joseph

doi:10.1201/b11963-32

Cited by 6 publications

(5 citation statements)

References 26 publications

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“…The virtual forces generated by both models fit well with the measurements. In steady-state, the force error for the steel plate and the silicone cube is always smaller than the the just noticeable difference (JND) for force (10% for the arm/forearm, see [21]). Thus, in steadystate, the estimated forces can not be distinguished from the measured ones by the operator.…”

Section: B Resultsmentioning

confidence: 90%

Improvement of model-mediated teleoperation using a new hybrid environment estimation technique

Achhammer

Weber

Peer

et al. 2010

2010 IEEE International Conference on Robotics and Automation

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In a haptic teleoperation system, the incorporation of knowledge about the remote environment in the controller design can improve stability and performance. Model-mediated teleoperation adopts this idea by rendering an estimated model of the remote environment on local site instead of transmitting force/velocity flows. Thus, the user perceives locally generated forces corresponding to the estimated and transmitted model parameters and the control loop between master and slave is opened. Less conservative stability boundaries and the applicability to teleoperation systems with arbitrary time delay are the main advantages of this approach. In order to guarantee a high fidelity, the estimation has to fit well with the measurements. In this paper, we extend the approach of modelmediated teleoperation to a full 6 degrees-of-freedom (DOF) teleoperation system with negligible time delay. We furthermore propose a hybrid approach for the estimation of the remote environment by combining the classical Kelvin-Voigt model and the nonlinear Hunt-Crossley model. Persistent excitation and device-dependent limitations of the estimation algorithm are discussed. Experimental results show stability and accuracy of the estimation technique as well as a superior fidelity of the proposed approach compared to a position-based admittance controller with fixed parameters even with negligible time delay.

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Section: B Resultsmentioning

confidence: 90%

Improvement of model-mediated teleoperation using a new hybrid environment estimation technique

Achhammer

Weber

Peer

et al. 2010

2010 IEEE International Conference on Robotics and Automation

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show abstract

“…A further confounding factor is that some users exhibit symptoms that parallel those of classical motion sickness, both during and after the VE experience [5,6]. This type of sickness, called cybersickness, is distinct from motion sickness in that the user is stationary, but has a compelling sense of motion induced through exposure to changing visual imagery [7,8]. found that vection and sickness can be generated by watching moving scenes in a VE [9].…”

Section: B Sickness In Vesmentioning

confidence: 99%

A study of sickness induced within a 3D virtual store and combated with fuzzy control in the elderly

Liu

Uang

2012

2012 9th International Conference on Fuzzy Systems and Knowledge Discovery

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Computers with an internet connection used at home can provide the elderly a new channel to access to information and services. However, most VEs lack information such as peripheral vision, responsiveness to limb-movement and, more often than not, subdued response to pleasantness. A further confounding factor is that some users exhibit symptoms that parallel those of classical motion sickness, both during and after the VE experience. Therefore, this study investigated the factors that contribute to sickness among the elderly when immersed into a 3D virtual store. The results of the first experiment showed that the rate of simulator sickness questionnaire (SSQ) scores increases significantly with navigational rotating speed and duration of exposure. In applying these findings, the fuzzy control was used to develop a fuzzy sickness warning system with contributing factors. The results of the second experiment showed that the proposed system can efficiently determine the level of sickness based on the associated subjective sickness estimates and combat sickness induced within a 3D virtual store.

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“…A further confounding factor is that some users exhibit symptoms that parallel those of classical motion sickness both during and after the VE experience [1]. This type of sickness, called cybersickness, has a compelling sense of motion induced through exposure to changing visual imagery [2]. found that vection and sickness can be generated by watching moving scenes in a VE [3].…”

Section: Cybersickness In Vesmentioning

confidence: 99%

An Efficient Control System for Combating Cybersickness in the Elderly within a Virtual Store

Liu

Uang

2013

AMM

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3D virtual store with an internet connection used at home can provide the elderly a new channel to buy something which they need. However, most virtual environments (VEs) more often lack subdued response to pleasantness. A further confounding factor is that some users exhibit symptoms that parallel those of classical motion sickness, called cybersickness, both during and after the VE experience. The study investigated the factors that contribute to cybersickness among the elderly when immersed into a 3D virtual store. The results of the first experiment showed that the rate of simulator sickness questionnaire (SSQ) scores increases significantly with navigational rotating speed and duration of exposure. In applying these findings, a warning system with fuzzy control for combating cybersickness was developed. The results of the second experiment showed that the proposed system can efficiently determine the level of cybersickness based on the associated subjective sickness estimates and combat cybersickness induced within a 3D virtual store.

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Virtual Environments

Cited by 6 publications

References 26 publications

Improvement of model-mediated teleoperation using a new hybrid environment estimation technique

Improvement of model-mediated teleoperation using a new hybrid environment estimation technique

A study of sickness induced within a 3D virtual store and combated with fuzzy control in the elderly

An Efficient Control System for Combating Cybersickness in the Elderly within a Virtual Store

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